Following a breakup with Joe Jonas, Demi Lovato clung to an older actor, Wilmer Valderrama. Before the Disney star entered a facility for “emotional and physical” issues, sources said Lovato, 18, introduced pals to the “That ’70s Show” star as her boyfriend. Valderrama, 30, first connected with Lovato when they filmed a public-service spot together in Chile for earthquake relief in March, around the time she announced her relationship with Jonas. “The two started seeing each other in May right after her breakup with Jonas,” a source on the tour said. “She would show us pictures of them together.” Another source said Valderrama has been a big part of Lovato’s life leading right up to her decision to seek treatment. Meanwhile, Jonas has been dating “Twilight” star Ashley Greene. Lovato’s rep had no comment while Valderrama’s rep denied a relationship.